NOIR Filter Frame #35 01 AmberNOIR Amber medium sized wrap around filters. These glasses have a visual light transmittance of 15%. VLT is the percentage of the visible spectrum (400 to 720nm) passing through the lens, weighted against the sensitivity of the human eye. The higher the VLT, the lighter the color and the more light passing through the lens. The frames feature a sleek modern look with adjustable temple arms for maximum comfort and use.